94.
95.
96.
97.
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99.
100.
While testing for COD of sewage, organic matter is oxidized by K,Cr,O, in the presence of :
(A) HCl (B) H,S80,
(C) HNO, (D) None of these
High COD to BOD ratio of an organic pollutant represents :
(A) High biodegradability of the pollutant
(B) Low biodegradability of the pollutant
(C) Presence of free oxygen for aerobic decomposition
(D) Presence of toxic material in the p....
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